We see from Fig. REF  that for the parameter \(M<0\) , the function \(h\)  is a monotonically increasing function of \(\rho \) , approaching \(c_\pm ^2\)  as \(\rho \rightarrow \pm \infty \) . The gravitational force is thus always pointing to the negative \(\rho \)  direction. In other words, the wormhole is attractive in the \(\rho > 0\)  world, whilst it is repulsive in the \(\rho <0\)  world. This is consistent with the fact that \(M_+>0\) , but \(M_-<0\) . These interesting feartures could also be found in the charged Ellis wormhole [1]}. It is also important to note that for static observers at the two asymptotic \(\rho \rightarrow \pm \infty \)  regions, the experienced time flow is different, namely
\((\Delta t)^+ = {\frac{c_-}{c_+}} (\Delta t)^-\,.\) 
